washing machine

Abstract

To provide a washing machine that can accurately detect the type (quality) and amount of dirt on laundry. [Solution] The washing machine 1 comprises an outer tub 3 for storing wash water, a washing tub 4 rotatably positioned inside the outer tub 3 for accommodating laundry, a rotating blade 5 located at the bottom of the washing tub 4 for agitating the laundry contained in the washing tub 4, a water supply mechanism 6 for supplying water into the washing tub 4, a drive device 8 that generates a driving force to rotate the washing tub 4 or the rotating blade 5, a control device 12 that controls the water supply mechanism 6 and the drive device 8, and a water quality sensor 10 for detecting the water quality of the wash water stored in the outer tub 3. At the bottom of the outer tub 3, a closed space 30 is formed, surrounded by a wall extending upward from the bottom surface of the outer tub 3. An opening is formed in a part of the wall surrounding the closed space 30, and the water quality sensor 10 is located in the closed space 30 of the outer tub 3.

Description

Technical Field

[0001] The present disclosure relates to a washing machine.

Background Art

[0002] Patent Document 1 discloses a washing machine that detects the amount of dirt in washing water and controls the washing process and the rinsing process. In detecting the amount of dirt in the washing water, a sensor that measures the transmittance or conductivity of the washing water is used. The sensor is disposed within a drainage mechanism.

[0003] For example, in the washing process, dirt from the laundry dissolves into the washing water by the detergent or agitation, and the washing water becomes turbid. Or, dirt containing mainly conductive components such as sweat from the laundry dissolves into the washing water. Therefore, by measuring the transmittance or conductivity of the washing water, it is possible to judge the amount of dirt in the washing water, the completion degree of washing, the completion degree of rinsing, and the like.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Within the drainage mechanism, the influence of the water flow due to the rotation of the washing tub or the pulsator is small, the initially introduced washing water stays, and it is difficult to replace it with the washing water into which dirt has gradually dissolved from the laundry. Therefore, within the drainage mechanism, it is difficult to accurately detect the type (quality) and amount of dirt in the washing water, that is, it is difficult to accurately detect the type (quality) and amount of dirt on the laundry.

[0006] An object of the present disclosure is to provide a washing machine capable of accurately detecting the type (quality) and amount of dirt on the laundry.

Means for Solving the Problems

[0007] (1) The washing machine according to the present disclosure comprises an outer tub for storing washing water, a washing tub rotatably disposed within the outer tub for accommodating laundry, a rotating blade provided at the bottom of the washing tub for agitating the laundry contained in the washing tub, a water supply mechanism for supplying water into the washing tub, a drive device for generating a driving force to rotate the washing tub or the rotating blade, a control device for controlling the water supply mechanism and the drive device, and a water quality sensor for detecting the water quality of the washing water stored in the outer tub. A closed space is formed at the bottom of the outer tub, surrounded by a wall extending upward from the bottom surface of the outer tub, and an opening is formed in a part of the wall surrounding the closed space, and the water quality sensor is located in the closed space of the outer tub.

[0008] According to the washing machine of this disclosure, since the water quality sensor is located in a closed space at the bottom of the outer tub, it is less susceptible to the influence of the flow of washing water caused by the rotation of the washing tub or rotor blades, and can accurately detect the water quality of the washing water, that is, the type and amount of dirt in the washing water from which the dirt of the laundry has dissolved, that is, the type and amount of dirt on the laundry.

[0009] Furthermore, according to the washing machine of this disclosure, the enclosed space is surrounded by a wall extending upward from the bottom of the outer tub, and an opening is formed in a part of the wall surrounding the enclosed space. As a result, the washing water in the enclosed space is replaced through the opening due to the flow of washing water caused by the rotation of the washing tub or rotor blades. This allows the water quality sensor to detect the latest washing water quality and accurately detect the type and amount of dirt in the washing water from which the dirt from the laundry has dissolved, i.e., the type and amount of dirt on the laundry.

[0010] (2) In the washing machine described in (1), the enclosed space is located at the periphery of the bottom of the outer tub, and the opening may be located in a part of the wall surrounding the enclosed space that is in the opposite direction to the rotation direction of the washing tub and the rotor blade.

[0011] According to this, the rotation of the washing tub or rotor blades and the centrifugal force cause the washing water to flow from the opening into the closed space, and the washing water in the closed space is replaced.

[0012] (3) In the washing machine described in (1), the water quality sensor may be a sensor that detects at least one of the following water quality parameters: hydrogen ion concentration pH, oxidation-reduction potential ORP, total organic carbon content TOC, suspended solids SS, total dissolved solids TDS, electrical conductivity EC, water hardness, and turbidity.

[0013] According to this, it is possible to handle various types of stains on laundry.

[0014] (4) In the washing machine described in any of (1) to (3), the water quality sensor measures water quality data of the wash water at the initial stage of water supply before the washing process, and measures water quality data of the wash water after operating for a predetermined time with a predetermined amount of water before detergent is added before the washing process. The control device may then compare the water quality data at the initial stage of water supply with the water quality data after operating for a predetermined time before detergent is added to estimate the degree of soiling of the laundry and determine the type and amount of detergent appropriate for the estimated degree of soiling of the laundry.

[0015] According to this method, instead of determining the amount of detergent to use based on the amount of laundry as in conventional methods, the type and amount of detergent to use are determined to be appropriate for the degree and amount of soiling of the laundry, thus improving the quality of the laundry.

[0016] (5)(4) The washing machine described above may further include a display device that displays the type and amount of detergent determined by the control device.

[0017] This allows the user to be informed of the appropriate type and amount of detergent to use for the type of stain on their laundry.

[0018] (6) In a washing machine described in any of (1) to (3), the water quality sensor measures the water quality data Wq11 of the wash water immediately after the start of the wash cycle after detergent is added in the wash cycle, measures the water quality data Wq12 of the wash water after a predetermined time has elapsed after the start of the wash cycle, and measures the water quality data Wq13 of the wash water before the end of the wash cycle. The control device estimates the degree of dirt removal from the laundry by comparing the water quality data immediately after the start of the wash cycle, the water quality data after a predetermined time has elapsed after the start of the wash cycle, and the water quality data before the end of the wash cycle. If the rate of change of the amount of dirt in the wash water does not satisfy the following formula (1), the control device determines that the degree of dirt removal from the laundry is insufficient and that the washing is insufficient, and adjusts the wash cycle. The rate of change in the amount of dirt in the wash water (Wq12-Wq11) ≥ the rate of change in the amount of dirt in the wash water (Wq13-Wq12) ... (1) In adjusting the washing cycle, the washing cycle time may be extended, or the rotation speed of the washing tub or the rotor blade may be increased.

[0019] According to this, during the washing cycle, the degree to which the laundry is cleaned is estimated based on the rate of change in the amount of dirt in the wash water, and if the washing is insufficient, the washing cycle is adjusted, thereby improving the washing results.

[0020] (7) In a washing machine as described in any of (1) to (3), the water quality sensor measures the water quality data Wq21 of the wash water immediately after the start of the rinse cycle in the final rinse process, measures the water quality data Wq22 of the wash water after a predetermined time has elapsed since the start of the rinse cycle in the final rinse process, and measures the water quality data Wq23 of the wash water before the end of the rinse cycle in the final rinse process. The control device estimates the degree of rinsing of the laundry by comparing the water quality data immediately after the start of the rinse cycle, the water quality data after a predetermined time has elapsed since the start of the final rinse cycle, and the water quality data before the end of the final rinse cycle. If the rate of change of the amount of dirt in the wash water does not satisfy the following formula (2), the control device determines that the laundry has not been rinsed sufficiently and that rinsing is insufficient, and adjusts the rinse cycle. The rate of change in the amount of dirt in the wash water (Wq22-Wq21) ≥ the rate of change in the amount of dirt in the wash water (Wq23-Wq22) ... (2) In the adjustment of the rinsing operation, the time of the rinsing operation may be extended, the rotational speed of the washing tub or the rotary blade may be increased, or the number of times of the rinsing operation may be increased.

[0021] According to this, in the rinsing operation, the rinsing condition of the laundry is estimated based on the change rate of the amount of dirt in the rinsing water, and if the rinsing is insufficient, the rinsing operation is adjusted, so that the finish of the washing can be improved.

[0022] (8) Another washing machine according to the present disclosure includes an outer tub for storing washing water, a washing tub rotatably disposed in the outer tub for accommodating laundry, a rotary blade provided at the bottom of the washing tub for stirring the laundry accommodated in the washing tub, a water supply mechanism for supplying water into the washing tub, a driving device for generating a driving force for rotating the washing tub and the rotary blade, a control device for controlling the water supply mechanism and the driving device, an irradiation device for irradiating the laundry accommodated in the washing tub with black light, and a measuring device for measuring fluorescence from the laundry. The control device detects the dirt of the laundry based on the fluorescence measured by the measuring device.

[0023] According to another washing machine of the present disclosure, since the dirt (type, amount) of the laundry that is difficult to see can be directly visualized by a fluorescence reaction, the dirt (type, amount) of the laundry can be accurately detected.

[0024] (9) In the another washing machine described in (8), the control device may irradiate the laundry with black light by the irradiation device while driving the washing tub or the rotary blade at an initial time before water supply after the laundry is loaded, and measure the fluorescence from the laundry a plurality of times by the measuring device.

[0025] According to this, since the fluorescence measurement is performed a plurality of times while driving the washing tub or the rotary blade before the washing water is supplied, the dirt (type, amount) of all the laundry can be directly visualized while moving the position of the laundry.

[0026] In another washing machine as described in (10)(8) or (9), the control device may estimate the degree of soiling of the laundry based on the fluorescence data from the measuring device and determine the type and amount of detergent appropriate for the estimated degree of soiling of the laundry.

[0027] According to this method, instead of determining the amount of detergent to use based on the amount of laundry as in conventional methods, the type and amount of detergent to use are determined to be appropriate for the degree and amount of soiling of the laundry, thus improving the quality of the laundry.

[0028] (11)(10) Another washing machine described above may further include a display device that displays the type and amount of detergent determined by the control device.

[0029] This allows the user to be informed of the appropriate type and amount of detergent to use for the type of stain on their laundry. [Effects of the Invention]

[0030] According to this disclosure, a washing machine can accurately detect the type (quality) and amount of dirt on laundry. [Brief explanation of the drawing]

[0031] [Figure 1] This is a side cross-sectional view of an example of a washing machine according to the first embodiment of this disclosure. [Figure 2] Figure 1 is a top view of the outer tub of a washing machine. [Figure 3] This is a flowchart of an example of a washing operation using a washing machine according to the first embodiment of this disclosure. [Figure 4] Figure 3 is a flowchart of the initial dirt detection process during the washing cycle. [Figure 5] Figure 3 is a flowchart of the washing process during a washing machine cycle. [Figure 6] Figure 3 is a flowchart of the rinsing process during a washing cycle. [Figure 7] This is a side cross-sectional view of an example of a washing machine according to a second embodiment of the present disclosure. [Figure 8] Figure 7 is a top view of the outer tub of a washing machine. [Figure 9] This figure shows an example of the types of stains on laundry and their corresponding excitation and fluorescence wavelengths. [Figure 10] This is a flowchart of an example of a washing operation using a washing machine according to the second embodiment of this disclosure. [Figure 11] Figure 10 is a flowchart of the initial soil detection process during the washing cycle. [Figure 12] Figure 10 is a flowchart of the washing process during a washing machine cycle. [Figure 13] Figure 10 is a flowchart of the rinsing process during a washing cycle. [Modes for carrying out the invention]

[0032] An example of an embodiment of this disclosure will be described below with reference to the attached drawings. In each drawing, the same or corresponding parts will be denoted by the same reference numerals.

[0033] (First Embodiment) Figure 1 is a side cross-sectional view of an example of a washing machine according to the first embodiment of this disclosure, and Figure 2 is a top view of the outer tub of the washing machine shown in Figure 1. Figures 1 and 2 show an XYZ Cartesian coordinate system. The X direction is the left-right direction of the washing machine, the Y direction is the front-back direction of the washing machine, and the Z direction is the up-down direction of the washing machine.

[0034] The washing machine 1 shown in Figure 1 is a so-called top-loading washing machine. The washing machine 1 comprises an outer tub 3, a washing tub 4, a pulsator (rotating impeller) 5, a water supply channel (water supply mechanism) 6, a drain channel 7, a motor (drive device) 8, a water quality sensor 10, a control device 12, and a display device 14 inside the housing 2. A door 2A is provided on the top surface of the housing 2 for loading and unloading laundry, such as clothes, into the washing tub 4.

[0035] The outer tub 3 is a cylindrical tub with a bottom and functions as a tub for storing washing water. A water supply channel 6 is provided at the top of the outer tub 3 for supplying water to the outer tub 3, and a water supply valve 6A for water supply control is provided in the water supply channel 6. In addition, a drain channel 7 is provided at the bottom of the outer tub 3 for draining the water from the outer tub 3, and a drain valve 7A for drainage control is provided in the drain channel 7.

[0036] Inside the outer tub 3 is a washing tub 4, and a motor 8 is located at the center of the bottom of the outer tub 3. The washing tub 4 is a cylindrical tub with a bottom, and a pulsator 5 for agitating the laundry inside the washing tub 4 is located at the center of the inner bottom surface of the washing tub 4. The washing tub 4 and the pulsator 5 are rotated by the motor 8 on a rotating shaft 8A.

[0037] A closed space 30 is formed at the periphery of the bottom of the outer tank 3, surrounded by walls 31-34 that extend upward from the inner bottom surface of the outer tank 3. For example, the inner bottom surface at the periphery of the bottom of the outer tank 3 is higher than the inner bottom surface at the center of the bottom of the outer tank 3, but the inner bottom surface of the closed space 30 is at the same height as the inner bottom surface at the center of the bottom of the outer tank 3. As a result, the closed space 30 is surrounded by a central side wall 31, a peripheral side wall 32, and end walls 33,34.

[0038] An opening 35 is formed in part of the walls 31-34 surrounding the enclosed space 30. For example, the opening 35 is formed in part of the central side wall 31 on the side opposite to the rotation direction A of the washing tub 4 and pulsator 5.

[0039] The water quality sensor 10 is located in a closed space 30 at the bottom of the outer tub 3. The water quality sensor 10 detects the quality of the wash water. Here, dirt from the laundry dissolves into the wash water. By detecting the quality of the wash water, the type of dirt on the laundry can be detected. In addition, by detecting the amount of dirt in the wash water, the amount of dirt dissolved from the laundry, i.e., the amount of dirt removed from the laundry, can be detected.

[0040] Since the water quality sensor 10 is located in the closed space 30 at the bottom of the outer tub 3, it is less susceptible to the influence of the flow of the washing water caused by the rotation of the washing tub 4 or the pulsator 5, and can accurately detect the water quality of the washing water, that is, the type and amount of dirt in the washing water from which the dirt from the laundry has dissolved, and that is, the type and amount of dirt on the laundry.

[0041] Furthermore, the enclosed space 30 is surrounded by walls 31-34 that extend upward from the bottom surface of the outer tub 3, and an opening 35 is formed in part of the walls 31-34 surrounding the enclosed space 30. As a result, the flow of wash water due to the rotation of the washing tub 4 or pulsator 5 causes the wash water in the enclosed space 30 to be replaced through the opening 35.

[0042] More specifically, the opening 35 is formed in a part of the central side wall 31 on the side opposite to the rotation direction A of the washing tub 4 and pulsator 5. Therefore, due to the rotation and centrifugal force in the rotation direction A of the washing tub 4 or pulsator 5, as shown by arrow B, wash water flows from the opening 35 into the closed space 30, and the wash water in the closed space 30 is replaced.

[0043] As a result, the water quality sensor 10 can detect the latest water quality of the laundry water and accurately detect the type and amount of dirt in the laundry water from which the dirt from the laundry has dissolved, i.e., the type and amount of dirt on the laundry.

[0044] The type of dirt on the laundry, that is, the water quality item detected by the water quality sensor 10, is at least one of the following:

[0045] (1) Hydrogen ion concentration (potential of Hydrogen: pH) pH represents the concentration of hydrogen ions in a solution. A pH of 7 is neutral, values ​​less than 7 are acidic, and values ​​greater than 7 are alkaline. The lower the pH, the higher the hydrogen ion concentration. A decrease of 1 in pH increases the hydrogen ion concentration tenfold, while an increase of 1 in pH reduces it to 1 / 10th of its original concentration. Since hydrogen ions are the cause of acidity, the lower the pH is below 7, the stronger the acidity. On the other hand, hydroxide ions are the cause of alkalinity. When the hydrogen ion concentration in an aqueous solution is reduced to 1 / 10th, the hydroxide ion concentration increases tenfold according to the law of mass action, so the higher the pH is above 7, the stronger the alkalinity.

[0046] (2) Oxidation-reduction potential (ORP) In ORP, the + side is oxidizing (prone to rusting), and the - side is reducing (resistant to rusting). The unit is mV.

[0047] For example, the type and amount of dirt can be estimated from (1) and (2). For instance, if the pH is less than 7 and acidic, the estimated types of dirt are organic matter, such as wine, beer, alcoholic beverages (Japanese and Western), carbonated drinks, meat and seafood, dairy products, and confectionery. Furthermore, the lower the pH is than 7, the stronger the acidity and the greater the estimated amount of dirt. Alkaline detergents are suitable for these types of dirt, and it is preferable to increase the amount of detergent as the amount of dirt increases.

[0048] On the other hand, if the pH is greater than 7 and therefore alkaline, the estimated types of dirt are inorganic substances such as minerals, calcium, green and yellow vegetables, seaweed, mushrooms, and legumes. Furthermore, the greater the pH greater than 7, the stronger the alkalinity and the greater the estimated amount of dirt. Acidic detergents are suitable for these types of dirt, and it is preferable to increase the amount of detergent as the amount of dirt increases.

[0049] Similarly, for example, if the ORP is on the positive side and indicates oxidizing activity, the presumed types of dirt include organic matter such as wine, beer, alcoholic beverages (Japanese and Western), carbonated drinks, green tea, sauces, and fruits (pears, apples, bananas, oranges, lemons, peaches, grapes). Furthermore, the larger the absolute value of ORP, the stronger the oxidizing activity and the greater the amount of dirt is presumed to be. Alkaline detergents are suitable for these types of dirt, and it is preferable to increase the amount of detergent as the amount of dirt increases.

[0050] On the other hand, if the ORP is negative and reducing, for example, the estimated types of dirt are inorganic substances such as minerals, calcium, cucumbers, sweet potatoes, corn, lettuce, soy sauce, oily fish, and small fish. Also, the larger the absolute value of ORP, the stronger the alkalinity and the greater the estimated amount of dirt. Acidic detergents are suitable for these types of dirt, and it is preferable to increase the amount of detergent as the amount of dirt increases.

[0051] For example, known water quality sensors and water quality measuring instruments can be used as measuring instruments for (1) and (2).

[0052] (3) Chemical Oxygen Demand (COD) COD (Chemical Oxygen Demand) is a measure of organic matter content in water, expressed as the amount of oxidizing agent consumed in terms of oxygen. A higher COD value generally indicates a greater amount of organic matter in the water and a higher degree of water pollution. In other words, COD is an indicator of organic pollution in water quality. The unit is ppm or mg / L.

[0053] (4) Total organic carbon (TOC) TOC (Total Organic Carbon) represents the total amount of oxidizable organic matter in water, expressed as carbon content. In other words, TOC is an indicator of organic pollution in water quality. The unit is mg / L.

[0054] (5) Dissolved Organic Carbon (DOC) DOC is the mass of organic carbon dissolved in water. For example, DOC is the amount of carbon that can pass through a filter with a pore size of 0.22 μm to 0.7 μm. The residue remaining after filtering is called particulate organic carbon (POC) or dissolved organic matter (DOM). The unit is mg / L.

[0055] (3) and (4) are similar detection items. Also, (5) is a detection item included in (4).

[0056] For example, the type and amount of dirt can be estimated from (4). For example, the types of dirt estimated by TOC include organic matter such as oils, proteins, sebum / blood, sweat / urine, beer, carbonated drinks, etc. Also, the larger the TOC, the greater the estimated amount of dirt. Alkaline detergents are suitable for these types of dirt, and it is preferable to increase the amount of detergent as the amount of dirt increases.

[0057] For example, known organic substance sensors can be used as measuring instruments for (3) to (5).

[0058] (6) Suspended Solids (SS) SS is a general term for insoluble substances (other than organic matter) with a particle size of 2 mm or less that are suspended in water, and is also called suspended substance. The unit is mg / L.

[0059] (7) Total Dissolved Solids (TDS) TDS (Total Dissolved Solids) indicates the total concentration of inorganic salts (mainly Ca, Mg, K, Na, bicarbonates, chlorides, and sulfates) and organic substances dissolved in water. A lower TDS value indicates fewer impurities. The unit is mg / L or ppm.

[0060] For example, the total amount of contaminants (inorganic substances) can be estimated from (6) and (7). For example, the types of contaminants estimated from SS and TDS are inorganic substances, such as minerals like Ca, Mg, K, Na, bicarbonates, chlorides, and sulfates. Also, the larger the SS and TDS, the greater the estimated amount of contaminants. Acidic detergents are suitable for these types of contaminants, and it is preferable to increase the amount of detergent as the amount of contaminants increases.

[0061] For example, known turbidity / SS sensors and water quality meters can be used as measuring instruments for (6) and (7). Alternatively, (8), which will be described later, may be measured and converted to (7). Alternatively, (7) may be replaced with (4) + (9).

[0062] (8)Electric Conductivity (EC) EC (electrical conductivity) indicates how easily electricity flows through water. The higher the electrolyte content, the easier the electricity flows, and the higher the EC value. The higher the amount of dissolved nitrogen in the water, the higher the EC value. The unit is S / m.

[0063] For example, the total amount of dirt (inorganic matter) can be estimated from (8). For example, the types of dirt estimated by EC include inorganic substances such as minerals like Ca, Mg, K, Na, bicarbonates, chlorides, and sulfates, or organic substances such as sweat. Furthermore, the larger the EC, the greater the estimated amount of dirt. Acidic detergents are suitable for these types of dirt, and it is preferable to increase the amount of detergent as the amount of dirt increases.

[0064] For example, (8) could refer to known water quality sensors, water quality measuring instruments, etc.

[0065] (9) Water hardness Water hardness represents the mass of calcium (Ca) or magnesium (Mg) contained in water. Water with low hardness is called soft water, and water with high hardness is called hard water. The unit is mg / L.

[0066] For example, the total amount of contaminants (inorganic matter) can be estimated from (9). For example, the type of contaminant estimated by water hardness is inorganic matter, such as minerals like Ca and Mg. Also, the higher the water hardness, the greater the estimated amount of contaminant. Acidic detergents are suitable for this type of contaminant, and it is preferable to increase the amount of detergent as the amount of contaminant increases.

[0067] For example, (9) could refer to a well-known water hardness meter.

[0068] (10) Turbidity Turbidity represents the degree of turbidity in water and is defined in JIS K0101 (Test Methods for Industrial Water). Turbidity is classified according to the measurement principle, such as visual turbidity, transmitted light turbidity, scattered light turbidity, and integrating sphere turbidity. There are also multiple measurement methods, including transmitted light measurement, scattered light measurement, surface scattered light method, and combinations thereof, and it is necessary to use the appropriate method depending on the situation and application. The unit varies depending on the standard solution and is KTU (Kaolin Turbidity Unit), FTU (Formazin Turbidity Unit), NTU (Nephelometric Turbidity Unit), or degrees.

[0069] For example, the type and amount of dirt can be estimated from (10). For example, the types of dirt estimated by turbidity include water-soluble stains such as red wine, coffee, ketchup, and soy sauce, as well as detergents. Furthermore, the greater the turbidity, the greater the estimated amount of dirt. Neutral detergents are suitable for these types of dirt, and it is preferable to increase the amount of detergent as the amount of dirt increases.

[0070] For example, (10) could be a well-known turbidity / SS sensor.

[0071] Since the detection accuracy of these water quality parameters may vary depending on the water temperature, the measurement data may be corrected for water temperature.

[0072] The control device 12 performs overall control of the washing machine 1. For example, the control device 12 controls the washing operation. The control device 12 also controls the water supply valve 6A, the drain valve 7A, and the motor 8.

[0073] The control device 12 is composed of, for example, an arithmetic processor such as a CPU (Central Processing Unit), a DSP (Digital Signal Processor), or an FPGA (Field-Programmable Gate Array). The various functions of the control device 12 are realized, for example, by executing predetermined software (programs) stored in the memory unit. The various functions of the control device 12 may be realized through the cooperation of hardware and software, or they may be realized by hardware (electronic circuits) alone. The memory unit is composed of, for example, a memory such as a ROM (Read Only Memory), an HDD (Hard Disk Drive), or an SSD (Solid State Drive). The memory unit stores predetermined software (programs) that realize the various functions of the control device 12.

[0074] Before the start of the wash cycle, the control device 12 estimates the degree of soiling of the laundry based on the water quality data measured by the water quality sensor 10, and determines the appropriate type and amount of detergent to use for the estimated degree of soiling of the laundry. Furthermore, during the wash cycle, the control device 12 estimates the degree of soiling of the laundry based on the water quality data measured by the water quality sensor 10, and adjusts the wash cycle (extend time, increase rotation speed, etc.) if the washing is insufficient. Furthermore, during the rinse cycle, the control device 12 estimates the degree of rinsing of the laundry based on the water quality data measured by the water quality sensor 10, and adjusts the rinse cycle (extend time, increase rotation speed, increase number of rinses, etc.) if the rinsing is insufficient.

[0075] The display device 14 is located on the upper front side of the housing 2. The display device 14 is a device that displays and notifies the type and amount of detergent to be dispensed, as determined by the control device 12. The display device 14 consists of a display or the like.

[0076] Next, the washing operation using the washing machine 1 of the first embodiment described above will be explained. Figure 3 is a flowchart of an example of the washing operation using the washing machine of the first embodiment according to this disclosure, Figure 4 is a flowchart of an example of the initial dirt detection process shown in Figure 3, Figure 5 is a flowchart of an example of the washing process shown in Figure 3, and Figure 6 is a flowchart of an example of the rinsing process shown in Figure 3.

[0077] The user places the laundry into the washing tub 4 and starts the washing cycle by operating the control device (not shown).

[0078] <Load detection process> When the washing operation starts, as shown in Figure 3, the control device 12 first detects the amount of laundry in the washing tub 4, i.e., the load (S1). For example, the control device 12 operates the motor 8 to rotate the pulsator 5 or the washing tub 4 and detects the load based on the drive current of the motor 8 or the amount of inertial rotation until the motor 8 stops. The control device 12 sets the amount of water supplied in the washing and rinsing processes (wash water level, rinse water level) according to the detected load.

[0079] <Initial contamination detection process> Next, the control device 12 performs the initial contamination detection process (S2). <<Water supply treatment (no detergent added)>> As shown in Figure 4, the control device 12 controls the water supply valve 6A and the drain valve 7A to supply water to the washing tub 4 and the outer tub 3, and fills the washing water to a predetermined water level lower than the wash water level mentioned above (S201).

[0080] <<Water Quality Detection Treatment>> At this time, that is, at the initial stage of water supply in the initial dirt detection process, the control device 12 controls the water quality sensor 10 to detect the water quality of the washing water and measure the water quality data of the washing water (at the initial stage of first water supply) (S202).

[0081] <<Agitation or tank rotation treatment>> Next, the control device 12 performs an agitation process to agitate the laundry by rotating the pulsator 5 for a predetermined time (S203). For example, the control device 12 intermittently drives the motor 8 to rotate it in and out of direction alternately at predetermined time intervals (for example, intervals of 1 to 2 seconds) at a predetermined rotation speed (for example, 90 rpm to 150 rpm). Alternatively, the control device 12 performs a tub rotation process to agitate the laundry by rotating the washing tub 4 for a predetermined time (S203). For example, the control device 12 operates the motor 8 to rotate the washing tub 4 together with the pulsator 5 in the same direction at a predetermined rotation speed (for example, about 200 rpm) at high speed. This causes the dirt on the laundry to dissolve into the wash water.

[0082] <<Water Quality Detection Treatment>> At this time, that is, after operating for a predetermined time with a predetermined amount of water before detergent is added in the initial dirt detection process, the water quality sensor 10 detects the water quality of the wash water and measures the water quality data of the wash water (at the start of the second water supply) under the control of the control device 12 (S204).

[0083] <<Detergent type, amount to be added, and notification processing>> Next, the control device 12 compares the water quality data at the beginning of water supply (first initial state) with the water quality data after operation for a predetermined time before detergent is added (second initial state) to estimate the degree of soiling (type and amount) of the laundry dissolved from the laundry, i.e., the degree of soiling (type and amount) of the laundry. If the amount of soiling dissolved from the laundry in the wash water is high, it can be estimated that the laundry is heavily soiled. The control device 12 determines the type of detergent appropriate for the estimated degree of soiling (type and amount) of the laundry. The control device 12 also determines the amount of detergent to add according to the load amount detected in the load amount detection step described above and the estimated degree of soiling (type and amount) of the laundry. The control device 12 notifies the user of the determined type and amount of detergent to add by displaying it on the display device 14 (S205). This completes the initial soiling detection step.

[0084] Thus, instead of determining the amount of detergent to use based on the amount of laundry as in conventional methods, the system determines the appropriate type and amount of detergent to use based on the type and amount of soiling of the laundry, thereby improving the quality of the laundry.

[0085] <Washing process> Returning to Figure 3, once the initial dirt detection process is complete, the control device 12 performs the washing process (S3). <<Water supply treatment (with detergent added)>> As shown in Figure 5, the control device 12 controls the water supply valve 6A and the drain valve 7A to supply water to the washing tub 4 and the outer tub 3, filling them with wash water up to the wash water level set as described above. At this time, the control device 12 automatically dispenses the type and amount of detergent set as described above (S301). Alternatively, the user may manually dispense the type and amount of detergent set as described above.

[0086] <<Agitation or tank rotation treatment>> Next, the control device 12 performs an agitation process to agitate the laundry by rotating the pulsator 5 (S302). For example, the control device 12 intermittently drives the motor 8 to rotate it in and out of direction alternately at predetermined time intervals (for example, intervals of 1 to 2 seconds) at a predetermined rotation speed (for example, 90 rpm to 150 rpm). Alternatively, the control device 12 performs a tub rotation process to agitate the laundry by rotating the washing tub 4 for a predetermined time (S207). For example, the control device 12 operates the motor 8 to rotate the washing tub 4 together with the pulsator 5 in the same direction at a predetermined rotation speed (for example, about 200 rpm) at high speed. This causes the dirt on the laundry to dissolve into the wash water.

[0087] <<Water Quality Detection Treatment>> At this time, that is, immediately after the start of the wash cycle after detergent is added in the washing process, the control device 12 controls the water quality sensor 10 to detect the water quality of the wash water and measure the water quality data Wq11 (S303). After a predetermined time has elapsed after the start of the wash cycle in the washing process (for example, 1 minute or more and 10 minutes or less), the control device 12 controls the water quality sensor 10 to detect the water quality of the wash water and measure the water quality data Wq12 (S304). Also, before the end of the wash cycle in the washing process, the control device 12 controls the water quality sensor 10 to detect the water quality of the wash water and measure the water quality data Wq13 (S305).

[0088] <<Washing process completion determination and adjustment process>> At this time, the control device 12 compares the water quality data Wq11 immediately after the start of the wash cycle, the water quality data Wq12 after a predetermined time has elapsed since the start of the wash cycle, and the water quality data Wq13 before the end of the wash cycle to estimate the amount of dirt dissolved from the laundry into the wash water, i.e., the degree to which the laundry has been cleaned. If the amount of dirt dissolved from the laundry into the wash water is large, it can be estimated that the laundry has been cleaned well.

[0089] Specifically, if the rate of change in the amount of dirt in the washing water does not satisfy the following formula (1), the control device 12 determines that the laundry is not sufficiently cleaned and that the washing is insufficient (NO in S306), and adjusts the washing operation (S307). The rate of change in the amount of dirt in the wash water (Wq12-Wq11) ≥ the rate of change in the amount of dirt in the wash water (Wq13-Wq12) ... (1) Adjustments to the washing cycle include extending the washing time or increasing the rotation speed of the washing tub 4 or pulsator 5. On the other hand, if the rate of change in the amount of dirt in the washing water satisfies the above formula (1), the control device 12 determines that the laundry has been sufficiently cleaned and washed sufficiently, and decides to end the washing cycle (YES in S306).

[0090] <<Water Quality Detection Treatment>> Before the end of the adjustment operation for the wash cycle in step S307, the control device 12 controls the water quality sensor 10 to detect the water quality of the wash water and measure the water quality data Wq14 of the wash water (S308).

[0091] <<Washing process completion determination and adjustment process>> At this time, the control device 12 again compares the water quality data Wq11 immediately after the start of the wash cycle, the water quality data Wq12 after a predetermined time has elapsed since the start of the wash cycle, the water quality data Wq13 before the end of the wash cycle, and the water quality data Wq14 before the end of the adjustment cycle for the wash cycle, in order to estimate the amount of dirt dissolved from the laundry into the wash water, that is, the degree to which the laundry has been cleaned.

[0092] Specifically, if the rate of change in the amount of dirt in the wash water does not satisfy the following formula, the control device 12 determines that the laundry is not sufficiently cleaned and that the washing is still insufficient (NO in S309), adjusts the washing operation one more time (S310), and determines that the washing operation is finished. The rate of change in the amount of dirt in the wash water (Wq12-Wq11) ≥ the rate of change in the amount of dirt in the wash water (Wq14-Wq13) On the other hand, if the rate of change in the amount of dirt in the washing water satisfies the above formula, the control device 12 determines that the laundry has been sufficiently cleaned and washed sufficiently, and decides to end the washing operation (YES in S309).

[0093] <<Wastewater Treatment>> In steps S306 and S309, when it is determined that the washing process is complete, the control device 12 controls the drain valve 7A to drain the washing water accumulated in the washing tub 4 and the outer tub 3 (step S311). This completes the washing process.

[0094] <Intermediate dehydration process> Returning to Figure 3, once the washing process is complete, the control device 12 performs an intermediate dewatering process (S4). For example, the control device 12 operates the motor 8 to rotate the washing tub 4 together with the pulsator 5 at a predetermined dewatering rotation speed (e.g., 800 rpm).

[0095] At this time, the control device 12 may perform a shower rinse process. In the shower rinse process, the control device 12 controls the water supply valve 6A to supply water to the washing tub 4 and the outer tub 3, and operates the motor 8 to rotate the washing tub 4 together with the pulsator 5 at a low speed. After the shower rinse process, the control device 12 performs the intermediate dewatering process described above again.

[0096] <Rinsing process> Once the washing and intermediate dewatering processes are complete, the control device 12 executes the (soaking) rinse process once or multiple times (S5). Then, in the final rinse process, the control device 12 controls as follows.

[0097] <<Water Treatment>> As shown in Figure 6, the control device 12 controls the water supply valve 6A and the drain valve 7A to supply water to the washing tub 4 and the outer tub 3, and fills the washing water to the rinse water level set as described above (S501).

[0098] <<Agitation or tank rotation treatment>> Next, the control device 12 performs an agitation process to agitate the laundry by rotating the pulsator 5 (S502). For example, the control device 12 intermittently drives the motor 8 to rotate it in and out of direction alternately at predetermined time intervals (for example, intervals of 1 to 2 seconds) at a predetermined rotation speed (for example, 90 rpm to 150 rpm). Alternatively, the control device 12 performs a tub rotation process to agitate the laundry by rotating the washing tub 4 for a predetermined time (S502). For example, the control device 12 operates the motor 8 to rotate the washing tub 4 together with the pulsator 5 in the same direction at a predetermined rotation speed (for example, about 200 rpm) at high speed. This causes the detergent and dirt from the laundry to dissolve into the wash water.

[0099] <<Water Quality Detection Treatment>> At this time, that is, immediately after the start of the rinse operation in the final rinse process, the control device 12 controls the water quality sensor 10 to detect the water quality of the wash water and measure the water quality data Wq21 of the wash water (S503). Furthermore, after a predetermined time has elapsed since the start of the rinse operation in the final rinse process (for example, 1 minute or more and 2 minutes or less), the control device 12 controls the water quality sensor 10 to detect the water quality of the wash water and measure the water quality data Wq22 of the wash water (S504). Furthermore, before the end of the rinse operation in the final rinse process, the control device 12 controls the water quality sensor 10 to detect the water quality of the wash water and measure the water quality data Wq23 of the wash water (S505).

[0100] <<Rinsing process completion determination and adjustment process>> At this time, the control device 12 compares the water quality data Wq21 immediately after the start of the final rinse cycle, the water quality data Wq22 after a predetermined time has elapsed since the start of the final rinse cycle, and the water quality data Wq23 before the end of the final rinse cycle to estimate the amount of detergent and dirt dissolved from the laundry into the wash water, i.e., the degree to which the laundry has been rinsed. If the amount of detergent and dirt dissolved from the laundry into the wash water is large, it can be estimated that the laundry has been rinsed well.

[0101] Specifically, if the rate of change in the amount of dirt in the washing water does not satisfy the following formula (2), the control device 12 determines that the rinsing of the laundry is insufficient (NO in S506) and adjusts the rinsing operation (S507). The rate of change in the amount of dirt in the wash water (Wq22-Wq21) ≥ the rate of change in the amount of dirt in the wash water (Wq23-Wq22) ... (2) In adjusting the rinse cycle, the rinse cycle time is extended, the rotation speed of the washing tub 4 or pulsator 5 is increased, or the number of rinse cycles is increased. On the other hand, if the rate of change in the amount of dirt in the wash water satisfies the above formula (2), the control device 12 determines that the laundry has been rinsed sufficiently and that rinsing is complete, and decides to end the rinse cycle (YES in S506).

[0102] <<Water Quality Detection Treatment>> Before the end of the adjustment operation for the rinse cycle in step S507, the control device 12 controls the water quality sensor 10 to detect the water quality of the wash water and measure the water quality data Wq24 of the wash water (S508).

[0103] <<Rinsing process completion determination and adjustment process>> At this time, the control device 12 again compares the water quality data Wq21 immediately after the start of the final rinse cycle, the water quality data Wq22 after a predetermined time has elapsed since the start of the final rinse cycle, the water quality data Wq23 before the end of the final rinse cycle, and the water quality data Wq24 before the end of the adjustment cycle for the final rinse cycle to estimate the amount of detergent and dirt dissolved from the laundry in the wash water, i.e., the degree to which the laundry has been rinsed.

[0104] Specifically, if the rate of change in the amount of dirt in the wash water does not satisfy the following formula, the control device 12 determines that the rinsing of the laundry is still insufficient (NO in S509), performs one more adjustment to the rinsing operation (S510), and determines that the final rinsing operation is complete. The rate of change in the amount of dirt in the wash water (Wq22-Wq21) ≥ the rate of change in the amount of dirt in the wash water (Wq24-Wq23) On the other hand, if the rate of change in the amount of dirt in the washing water satisfies the above formula, the control device 12 determines that the laundry has been rinsed sufficiently and that rinsing is complete, and decides to end the rinsing operation (YES in S509).

[0105] <<Wastewater Treatment>> In steps S506 and S509, when it is determined that the rinsing process is complete, the control device 12 controls the drain valve 7A to drain the rinse water accumulated in the washing tub 4 and the outer tub 3 (S511). This completes the rinsing process.

[0106] <Dehydration process> Returning to Figure 3, once the rinsing process is complete, the control device 12 performs the dewatering process (S6). For example, the control device 12 operates the motor 8 to rotate the washing tub 4 together with the pulsator 5 at a predetermined dewatering speed. In the final dewatering process, the dewatering speed is set higher than in the intermediate dewatering process (for example, 1000 rpm). In the final dewatering process, the dewatering time is set longer than in the intermediate dewatering process. With this, the washing operation by the washing machine 1 is completed.

[0107] As described above, according to the washing machine 1 of the first embodiment, the water quality sensor 10 is located in the closed space 30 at the bottom of the outer tub 3, so it is less affected by the flow of the washing water due to the rotation of the washing tub 4 or the pulsator 5, and can accurately detect the water quality of the washing water, that is, the type and amount of dirt in the washing water from which the dirt of the laundry has dissolved, that is, the type and amount of dirt on the laundry.

[0108] Furthermore, in the washing machine 1 of the first embodiment, the enclosed space 30 is surrounded by walls 31-34 that extend upward from the bottom surface of the outer tub 3, and an opening 35 is formed in a part of the walls 31-34 surrounding the enclosed space 30. As a result, the washing water in the enclosed space 30 is replaced through the opening 35 by the flow of washing water due to the rotation of the washing tub 4 or pulsator 5. This allows the water quality sensor 10 to detect the latest washing water quality and accurately detect the type and amount of dirt in the washing water from which the dirt from the laundry has dissolved, i.e., the type and amount of dirt on the laundry.

[0109] Furthermore, with the washing machine 1 of the first embodiment, instead of determining the amount of detergent to be added according to the amount of laundry as in the conventional method, the type and amount of detergent to be added is determined to be appropriate for the degree of soiling (type and amount) of the laundry, thereby improving the washing results.

[0110] Furthermore, according to the washing machine 1 of the first embodiment, during the washing cycle, the degree to which the laundry is cleaned is estimated based on the rate of change in the amount of dirt in the washing water, and if the washing is insufficient, the washing cycle is adjusted, thereby improving the quality of the laundry.

[0111] Furthermore, according to the washing machine 1 of the first embodiment, during the rinsing cycle, the degree of rinsing of the laundry is estimated based on the rate of change in the amount of dirt in the wash water, and if rinsing is insufficient, the rinsing cycle is adjusted, thereby improving the quality of the laundry.

[0112] (Second Embodiment) In the first embodiment described above, the type and amount of dirt on the laundry was estimated by detecting the type and amount of dirt in the laundry water dissolved from the laundry using a water quality sensor 10. In the second embodiment, the type and amount of dirt on the laundry is directly visualized and detected using a black light irradiation device and a fluorescence measuring device.

[0113] Figure 7 is a side cross-sectional view of an example of a washing machine according to the second embodiment of this disclosure, and Figure 8 is a top view of the outer tub of the washing machine shown in Figure 7.

[0114] The washing machine 1 of the second embodiment shown in Figure 7 differs from the washing machine 1 of the first embodiment shown in Figure 1 in that it is equipped with an irradiation device 20 and a measuring device 22 instead of a water quality sensor 10, that a closed space 30 is not formed at the bottom of the outer tub 3, and in the function and operation of the control device 12.

[0115] The irradiation device 20 and the measuring device 22 are positioned above the washing tub 4, for example, on the inner surface of the door 2A. The irradiation device 20 irradiates the laundry contained in the washing tub 4 with a black light (ultraviolet A wave, UVA). The measuring device 22 measures the fluorescence from the laundry. The measuring device 22 may include an imaging device such as a camera or a spectrometer, and the measurement data may include image data and fluorescence wavelength data.

[0116] Oils, proteins, amino acids, sebum / blood, sweat / urine, sports drinks / soft drinks, fruit juices, laundry detergents, live bacteria / molds, and other types of laundry stains will fluoresce under black light. Furthermore, the excitation wavelength and fluorescence wavelength differ for each type of laundry stain. Figure 9 shows an example of laundry stain types and their corresponding excitation and fluorescence wavelengths.

[0117] Before supplying water for the wash cycle, the control device 12 estimates the degree of soiling of the laundry based on the fluorescence data measured by the measuring device 22, and determines the appropriate type and amount of detergent to use based on the estimated degree of soiling of the laundry. After the wash cycle is completed, the control device 12 estimates the degree of soiling of the laundry based on the fluorescence data measured by the measuring device 22, and adjusts the wash cycle (re-washing, time adjustment, increasing rotation speed, etc.) if the washing is insufficient. After the rinse cycle is completed, the control device 12 estimates the degree of rinsing of the laundry based on the fluorescence data measured by the measuring device 22, and adjusts the rinse cycle (increasing the number of rinses, time adjustment, increasing rotation speed, etc.) if the rinsing is insufficient.

[0118] Next, the washing operation using the washing machine 1 of the second embodiment described above will be explained. Figure 10 is a flowchart of an example of the washing operation using the washing machine of the second embodiment according to this disclosure, Figure 11 is a flowchart of an example of the initial dirt detection process shown in Figure 10, Figure 12 is a flowchart of an example of the washing process shown in Figure 10, and Figure 13 is a flowchart of an example of the rinsing process shown in Figure 10.

[0119] The user places the laundry into the washing tub 4 and starts the washing cycle by operating the control device (not shown).

[0120] <Load detection process> When the washing cycle starts, as described above, the control device 12 first detects the amount of laundry in the washing tub 4, i.e., the load (S1), as shown in Figure 10. The control device 12 sets the amount of water supplied in the washing and rinsing cycles (wash water level, rinse water level) according to the detected load.

[0121] <Initial contamination detection process> Next, the control device 12 performs the initial contamination detection process (S2A).

[0122] <<Fluorescence Measurement Process (Initial Stage)>> As shown in Figure 11, in the initial stage of the initial soil detection process before water supply, the control device 12 controls the irradiation device 20 to irradiate the laundry with a black light, and the measuring device 22 measures the fluorescence from the laundry and measures fluorescence data (image data or fluorescence wavelength data) (S201A).

[0123] For example, while driving the washing tub 4 or pulsator 5, a black light is shone on the laundry using the irradiation device 20, and the fluorescence from the laundry is measured multiple times using the measuring device 22. This allows for the direct visualization of the type and amount of dirt on all laundry while moving the position of the laundry. For example, the type of dirt can be determined based on the excitation wavelength and fluorescence wavelength, as described above and as shown in Figure 9. Also, for example, the amount of dirt Da11 can be determined based on the dirt area (fluorescent area) and fluorescence intensity.

[0124] <<Detergent type, amount to be added, and notification processing>> Next, the control device 12 estimates the soiling status (type and amount) of the laundry based on the initial fluorescence data (image data or fluorescence wavelength data), and determines the type of detergent appropriate for the estimated soiling status (type and amount) of the laundry. The control device 12 also determines the amount of detergent to be added according to the load detected in the load detection step described above and the estimated soiling status (type and amount Da11) of the laundry. The control device 12 notifies the user of the determined type and amount of detergent to be added by displaying it on the display device 14 (S202A). This completes the initial soiling detection step.

[0125] Thus, instead of determining the amount of detergent to use based on the amount of laundry as in conventional methods, the system determines the appropriate type and amount of detergent to use based on the type and amount of soiling of the laundry, thereby improving the quality of the laundry.

[0126] Furthermore, the control device 12 may inform the user of a suitable washing method, such as soaking, based on the estimated soiling level (type and amount) of the laundry, by displaying it on the display device 14. This allows for the suggestion of a washing method suitable for the soiling level (type and amount) of the laundry, thereby improving the quality of the laundry.

[0127] <Washing process> Returning to Figure 10, once the initial dirt detection process is complete, the control device 12 performs the washing process (S3A). <<Water supply treatment (with detergent added)>> As shown in Figure 12, the control device 12 controls the water supply valve 6A and the drain valve 7A to supply water to the washing tub 4 and the outer tub 3, filling them with wash water up to the wash water level set as described above. At this time, the control device 12 automatically dispenses the type and amount of detergent set as described above (S301A). Alternatively, the user may manually dispense the type and amount of detergent set as described above.

[0128] <<Agitation or tank rotation treatment>> Next, the control device 12 performs an agitation process to agitate the laundry by rotating the pulsator 5 (S302A). For example, the control device 12 intermittently drives the motor 8 to rotate it in and out of direction alternately at predetermined time intervals (for example, intervals of 1 to 2 seconds) at a predetermined rotation speed (for example, 90 rpm to 150 rpm). Alternatively, the control device 12 performs a tub rotation process to agitate the laundry by rotating the washing tub 4 for a predetermined time (S204A). For example, the control device 12 operates the motor 8 to rotate the washing tub 4 together with the pulsator 5 in the same direction at a predetermined rotation speed (for example, about 200 rpm) at high speed. This causes the dirt on the laundry to dissolve into the wash water.

[0129] <<Wastewater Treatment>> When the washing process is completed for a predetermined time, the control device 12 controls the drain valve 7A to drain the washing water accumulated in the washing tub 4 and the outer tub 3 (step S303A).

[0130] <<Fluorescence Measurement Process>> Next, after the washing cycle in the washing process is completed, the control device 12 controls the irradiation device 20 to irradiate the laundry with a black light, and the measuring device 22 measures the fluorescence from the laundry and measures fluorescence data (image data or fluorescence wavelength data) (S304A).

[0131] For example, while driving the washing tub 4 or pulsator 5, a black light is shone on the laundry using the irradiation device 20, and the fluorescence from the laundry is measured multiple times using the measuring device 22. This allows for the direct visualization of the type and amount of dirt on all laundry while moving the position of the laundry. For example, the type of dirt can be determined based on the excitation wavelength and fluorescence wavelength, as described above and as shown in Figure 9. Also, for example, the amount of dirt Da12 can be determined based on the dirt area (fluorescent area) and fluorescence intensity.

[0132] <<Washing process completion determination and adjustment process>> At this time, the control device 12 estimates the degree to which the laundry has been cleaned by comparing the initial fluorescence data Da11 before water supply with the fluorescence data Da12 after the washing cycle is completed.

[0133] Specifically, if the initial amount of soiling on the laundry Da11 (soiled area × fluorescence intensity) before water supply and the amount of soiling on the laundry Da12 (soiled area × fluorescence intensity) after the washing cycle does not satisfy the following formula (3), the control device 12 determines that the laundry has not been cleaned sufficiently and that the washing was insufficient (NO in S306A), and adjusts the washing cycle (S307A). Amount of dirt on laundry Da11 ≥ Amount of dirt on laundry Da12...(3) Adjusting the wash cycle involves performing another wash cycle, setting the duration of the second wash cycle, increasing the rotation speed of the washing tub 4 or pulsator 5, etc. In the example shown in Figure 12, performing a second wash cycle involves water supply (without detergent) as in step S301A, agitation or tub rotation as in step S302A, and drainage as in step S303A. On the other hand, the control device 12 determines that the washing cycle is complete and that the laundry is sufficiently cleaned if the initial amount of soiling Da11 (soiled area × fluorescence intensity) of the laundry before water supply and the amount of soiling Da12 (soiled area × fluorescence intensity) of the laundry after the wash cycle satisfy the above formula (3).

[0134] <<Fluorescence Measurement Process>> After the adjustment run for the washing cycle in step S307A is completed, the control device 12 controls the irradiation device 20 to irradiate the laundry with a black light, and the measuring device 22 measures the fluorescence from the laundry and measures fluorescence data (image data or fluorescence wavelength data) (S308A).

[0135] For example, similar to step S304A, while driving the washing tub 4 or pulsator 5, the laundry is irradiated with a black light by the irradiation device 20, and the fluorescence from the laundry is measured multiple times by the measuring device 22. For example, the type of dirt can be determined based on the excitation wavelength and fluorescence wavelength, as described above and as shown in Figure 9. Also, for example, the amount of dirt Da13 can be determined based on the dirt area (fluorescent area) and fluorescence intensity.

[0136] <<Washing process completion determination and adjustment process>> At this time, the control device 12 again compares the fluorescence data Da12 obtained after the washing cycle is completed with the fluorescence data Da13 obtained after the adjustment cycle of the washing cycle is completed to estimate how well the laundry has been cleaned.

[0137] Specifically, if the amount of dirt on the laundry after the wash cycle Da12 (dirty area × fluorescence intensity) and the fluorescence data Da13 (dirty area × fluorescence intensity) after the adjustment cycle of the wash cycle do not satisfy the following formula, the control device 12 determines that the cleaning of the laundry is still insufficient and that the washing is still insufficient (NO in S309A), and performs the wash cycle adjustment one more time in the same manner as in step S307A (S310A), and then determines that the wash cycle is finished. Amount of dirt on laundry Da12 ≥ Amount of dirt on laundry Da13 On the other hand, if the amount of dirt on the laundry after the washing cycle Da12 (dirty area × fluorescence intensity) and the fluorescence data Da13 (dirty area × fluorescence intensity) after the adjustment cycle of the washing cycle satisfy the above formula, the control device 12 determines that the laundry has been sufficiently cleaned and that the washing is sufficient, and determines that the washing cycle is complete (YES in S309A). As a result, the washing process is completed.

[0138] <Intermediate dehydration process> Returning to Figure 10, once the washing process is complete, the control device 12 performs an intermediate dewatering process (S4). For example, the control device 12 operates the motor 8 to rotate the washing tub 4 together with the pulsator 5 at a predetermined dewatering speed (e.g., 800 rpm).

[0139] At this time, the control device 12 may perform a shower rinse process. In the shower rinse process, the control device 12 controls the water supply valve 6A to supply water to the washing tub 4 and the outer tub 3, and operates the motor 8 to rotate the washing tub 4 together with the pulsator 5 at a low speed. After the shower rinse process, the control device 12 performs the intermediate dewatering process described above again.

[0140] <Rinsing process> Once the washing and intermediate dewatering processes are complete, the control device 12 executes the (soaking) rinse process once or multiple times (S5A). Then, in the final rinse process, the control device 12 controls as follows.

[0141] <<Fluorescence Measurement Process (Initial Stage)>> As shown in Figure 13, at the initial stage before water supply in the final rinse process, the control device 12 controls the irradiation device 20 to irradiate the laundry with a black light, and the measuring device 22 measures the fluorescence from the laundry and measures fluorescence data (image data or fluorescence wavelength data) (S501A).

[0142] For example, while driving the washing tub 4 or pulsator 5, a black light is shone on the laundry using the irradiation device 20, and the fluorescence from the laundry is measured multiple times using the measuring device 22. This allows for the direct visualization of the type and amount of dirt on all laundry while moving the position of the laundry. For example, the type of dirt can be determined based on the excitation wavelength and fluorescence wavelength, as described above and as shown in Figure 9. Also, for example, the amount of dirt Da21 can be determined based on the dirt area (fluorescent area) and fluorescence intensity.

[0143] <<Water Treatment>> Next, the control device 12 controls the water supply valve 6A and the drain valve 7A to supply water to the washing tub 4 and the outer tub 3, filling them with wash water up to the rinse water level set as described above (S502A).

[0144] <<Agitation or tank rotation treatment>> Next, the control device 12 performs an agitation process to agitate the laundry by rotating the pulsator 5 (S503A). For example, the control device 12 intermittently drives the motor 8 to rotate it in and out of direction alternately at predetermined time intervals (for example, intervals of 1 to 2 seconds) at a predetermined rotation speed (for example, 90 rpm to 150 rpm). Alternatively, the control device 12 performs a tub rotation process to agitate the laundry by rotating the washing tub 4 for a predetermined time (S403A). For example, the control device 12 operates the motor 8 to rotate the washing tub 4 together with the pulsator 5 in the same direction at a predetermined rotation speed (for example, about 200 rpm) at high speed. This dissolves the detergent and dirt from the laundry into the wash water and removes them.

[0145] <<Wastewater Treatment>> When the final rinsing cycle is completed for a predetermined time, the control device 12 controls the drain valve 7A to drain the wash water accumulated in the washing tub 4 and the outer tub 3 (step S504A).

[0146] <<Fluorescence Measurement Process>> Next, after the rinsing cycle in the final rinse process is completed, the control device 12 controls the irradiation device 20 to irradiate the laundry with a black light, and the measuring device 22 measures the fluorescence from the laundry and measures fluorescence data (image data or fluorescence wavelength data) (S505A).

[0147] For example, while driving the washing tub 4 or pulsator 5, a black light is shone on the laundry using the irradiation device 20, and the fluorescence from the laundry is measured multiple times using the measuring device 22. This allows for the direct visualization of the type and amount of dirt on all laundry while moving the position of the laundry. For example, the type of dirt can be determined based on the excitation wavelength and fluorescence wavelength, as described above and as shown in Figure 9. Also, for example, the amount of dirt Da22 can be determined based on the dirt area (fluorescent area) and fluorescence intensity.

[0148] <<Rinsing process completion determination and adjustment process>> At this time, the control device 12 estimates the degree of rinsing of the laundry by comparing the initial fluorescence data Da21 before water supply with the fluorescence data Da22 after the rinsing operation is completed.

[0149] Specifically, if the initial amount of soiling of the laundry Da21 (soiled area × fluorescence intensity) before water supply and the amount of soiling of the laundry Da22 (soiled area × fluorescence intensity) after the rinsing cycle does not satisfy the following formula (4), the control device 12 determines that the rinsing of the laundry is insufficient (NO in S506A) and adjusts the rinsing cycle (S507A). Amount of dirt on laundry Da21 ≥ Amount of dirt on laundry Da22...(4) In adjusting the rinse cycle, the following can be done: perform another rinse cycle, set the time for the second rinse cycle, increase the rotation speed of the washing tub 4 or pulsator 5, etc. In the example shown in Figure 13, performing a second rinse cycle involves water supply treatment in the same way as in step S502A, agitation or tub rotation treatment in the same way as in step S503A, and drainage treatment in the same way as in step S504A. On the other hand, the control device 12 determines that the laundry has been sufficiently rinsed and that rinsing is sufficient if the initial amount of soiling of the laundry Da21 (soiled area × fluorescence intensity) before water supply and the amount of soiling of the laundry Da22 (soiled area × fluorescence intensity) after the rinse cycle satisfy the following formula (4), and determines that the rinse cycle is complete (YES in S506A).

[0150] <<Fluorescence Measurement Process>> After the adjustment run for the rinse cycle in step S507A is completed, the control device 12 controls the irradiation device 20 to irradiate the laundry with a black light, and the measuring device 22 measures the fluorescence from the laundry and measures fluorescence data (image data or fluorescence wavelength data) (S508A).

[0151] For example, similar to step S505A, while driving the washing tub 4 or pulsator 5, the laundry is irradiated with a black light by the irradiation device 20, and the fluorescence from the laundry is measured multiple times by the measuring device 22. For example, the type of dirt can be determined based on the excitation wavelength and fluorescence wavelength, as described above and as shown in Figure 9. Also, for example, the amount of dirt Da23 can be determined based on the dirt area (fluorescent area) and fluorescence intensity.

[0152] <<Rinsing process completion determination and adjustment process>> At this time, the control device 12 again estimates the degree of rinsing of the laundry by comparing the fluorescence data Da22 obtained after the rinsing cycle is completed with the fluorescence data Da23 obtained after the adjustment cycle of the rinsing cycle is completed.

[0153] Specifically, if the amount of soiling Da22 (soiled area × fluorescence intensity) of the laundry after the rinsing cycle and the fluorescence data Da23 (soiled area × fluorescence intensity) after the adjustment cycle of the rinsing cycle do not satisfy the following formula, the control device 12 determines that the rinsing of the laundry is still insufficient (NO in S509A), and performs the adjustment cycle of the rinsing cycle one more time in the same way as in step S507A (S510A), and determines that the rinsing cycle is finished. Amount of dirt on laundry Da22 ≥ Amount of dirt on laundry Da23 On the other hand, if the amount of soiling of the laundry after the rinsing cycle Da22 (soiled area × fluorescence intensity) and the fluorescence data Da23 (soiled area × fluorescence intensity) after the adjustment cycle for the rinsing cycle satisfy the above formula, the control device 12 determines that the laundry has been sufficiently rinsed and that rinsing is sufficient, and determines that the rinsing cycle is complete (YES in S509A). As a result, the rinsing process is completed.

[0154] <Dehydration process> Returning to Figure 10, once the rinsing process is complete, the control device 12 performs the dewatering process (S6). For example, the control device 12 operates the motor 8 to rotate the washing tub 4 together with the pulsator 5 at a predetermined dewatering speed. In the final dewatering process, the dewatering speed is set higher than in the intermediate dewatering process (for example, 1000 rpm). In the final dewatering process, the dewatering time is set longer than in the intermediate dewatering process. With this, the washing operation by the washing machine 1 is completed.

[0155] As explained above, according to the washing machine 1 of the second embodiment, the type and amount of dirt on the laundry, which was previously difficult to see, can be directly visualized by a fluorescent reaction, thus enabling accurate detection of the type and amount of dirt on the laundry.

[0156] Furthermore, in the washing machine 1 of the second embodiment, instead of determining the amount of detergent to be added according to the amount of laundry as in the conventional method, the type and amount of detergent to be added is determined to be appropriate for the degree of soiling (type and amount) of the laundry, thereby improving the washing results.

[0157] Furthermore, in the washing machine 1 of the second embodiment, the degree to which the laundry is cleaned is estimated based on the amount of dirt on the laundry during the washing cycle, and the washing cycle is adjusted if the washing is insufficient, thereby improving the washing result.

[0158] Furthermore, in the washing machine 1 of the second embodiment, the degree of rinsing of the laundry is estimated based on the amount of dirt on the laundry during the rinsing cycle, and the rinsing cycle is adjusted if rinsing is insufficient, thereby improving the washing result.

[0159] While embodiments of the present disclosure have been described above, the present disclosure is not limited to the embodiments described above, and various modifications, variations, and combinations are possible. For example, the embodiments described above illustrate a washing machine equipped only with a washing function. However, the features of the present disclosure are not limited to this and can also be applied to a washer-dryer equipped with both washing and drying functions.

[0160] Furthermore, the embodiments described above illustrate a so-called vertical washing machine. However, the features of this disclosure are not limited to this and can be applied to various types of washing machines, such as so-called drum-type washing machines (without a pulsator (rotating blade)). [Explanation of symbols]

[0161] 1. Washing machine 2 cabinets 2A Door 3 Outer tank 4. Washing tub 5. Pulsator (rotor blade) 6 Water supply channel (water supply mechanism) 6A Water supply valve 7 Drainage channel 7A Drain valve 8. Motor (drive device) 10 Water quality sensors 12 Control device 14 Display device 20 Irradiation device 22 Measuring device 30. Enclosed space 31-34 Wall 35 Aperture

Claims

1. An outer tub for collecting washing water, A washing tub for storing laundry is rotatably arranged inside the outer tub, A rotating blade is provided at the bottom of the washing tub and agitates the laundry contained in the washing tub, A water supply mechanism for supplying water into the washing tub, A drive device that generates a driving force to rotate the washing tub or the rotor blade, A control device that controls the water supply mechanism and the drive device, A water quality sensor for detecting the water quality of the washing water stored in the outer tub, Equipped with, At the bottom of the outer tank, a closed space is formed, surrounded by a wall that extends upward from the bottom surface of the outer tank. An opening is formed in a part of the wall surrounding the enclosed space. The water quality sensor is located in the closed space of the outer tank. washing machine.

2. The enclosed space is located at the peripheral edge of the bottom of the outer tank. The opening is located in a part of the wall surrounding the enclosed space, on the side opposite to the direction of rotation of the washing tub and the rotor blade. The washing machine according to claim 1.

3. The washing machine according to claim 1, wherein the water quality sensor is a sensor that detects at least one of the following water quality parameters: hydrogen ion concentration pH, oxidation-reduction potential ORP, total organic carbon content TOC, suspended solids content SS, total dissolved solids TDS, electrical conductivity EC, water hardness, and turbidity.

4. The water quality sensor is During the initial water supply phase before the washing cycle, water quality data of the wash water is measured. After running the machine for a predetermined time with a predetermined amount of water before adding detergent in the washing cycle, the water quality data of the wash water is measured. The control device is By comparing water quality data at the initial stage of water supply with water quality data after a predetermined period of operation before detergent is added, the degree of soiling of the laundry is estimated. Determine the appropriate type and amount of detergent to use for the estimated level of soiling in the laundry. A washing machine according to any one of claims 1 to 3.

5. The washing machine according to claim 4, further comprising a display device that displays the type and amount of detergent to be dispensed, as determined by the control device.

6. The water quality sensor is Immediately after the start of the wash cycle following the addition of detergent during the washing process, the water quality data Wq11 of the wash water was measured. After a predetermined time has elapsed since the start of the washing cycle in the washing process, the water quality data Wq12 of the washing water is measured. Before the end of the washing cycle in the washing process, the water quality data Wq13 of the wash water is measured. The control device is By comparing water quality data immediately after the start of the wash cycle, water quality data after a predetermined time has elapsed since the start of the wash cycle, and water quality data before the end of the wash cycle, the degree to which the laundry is cleaned is estimated. If the rate of change in the amount of dirt in the wash water does not satisfy the following formula (1), it is determined that the laundry has not been cleaned sufficiently and that the washing process is inadequate, and the washing cycle will be adjusted. The rate of change in the amount of dirt in the wash water (Wq12 - Wq11) ≥ the rate of change in the amount of dirt in the wash water (Wq13 - Wq12) ... (1) In adjusting the washing cycle, the washing cycle time is extended, or the rotation speed of the washing tub or the rotor blade is increased. A washing machine according to any one of claims 1 to 3.

7. The water quality sensor is Immediately after the start of the rinse cycle in the final rinse process, the water quality data Wq21 of the wash water is measured. After a predetermined time has elapsed since the start of the rinse cycle in the final rinse process, the water quality data Wq22 of the wash water is measured. Before the end of the rinsing cycle in the final rinse process, the water quality data Wq23 of the wash water is measured. The control device is By comparing water quality data immediately after the start of the rinse cycle, water quality data after a predetermined time has elapsed since the start of the final rinse cycle, and water quality data before the end of the final rinse cycle, the degree to which the laundry has been rinsed is estimated. If the rate of change in the amount of dirt in the wash water does not satisfy the following formula (2), the rinsing of the laundry is insufficient, and the rinsing cycle is adjusted accordingly. The rate of change in the amount of dirt in the wash water (Wq22 - Wq21) ≥ the rate of change in the amount of dirt in the wash water (Wq23 - Wq22) ... (2) The adjustment of the rinse cycle may involve extending the rinse cycle time, increasing the rotation speed of the washing tub or the rotor blade, or increasing the number of rinse cycles. A washing machine according to any one of claims 1 to 3.

8. An outer tub for collecting washing water, A washing tub for storing laundry is rotatably arranged inside the outer tub, A rotating blade is provided at the bottom of the washing tub and agitates the laundry contained in the washing tub, A water supply mechanism for supplying water into the washing tub, A drive device that generates a driving force to rotate the washing tub and the rotor blade, A control device that controls the water supply mechanism and the drive device, An illumination device that shines a black light on the laundry contained in the washing tub, A measuring device for measuring fluorescence from the aforementioned laundry, Equipped with, The control device detects the degree of soiling of the laundry based on the fluorescence measured by the measuring device. washing machine.

9. The washing machine according to claim 8, wherein the control device, in the initial period after loading laundry and before water supply, drives the washing tub or rotor blades, irradiates the laundry with a black light using the irradiation device, and measures the fluorescence from the laundry multiple times using the measuring device.

10. The control device is Based on the fluorescence data from the aforementioned measuring device, the degree of soiling of the laundry is estimated. Determine the appropriate type and amount of detergent for the estimated level of soiling in the laundry. The washing machine according to claim 8 or 9.

11. The washing machine according to claim 10, further comprising a display device that displays the type and amount of detergent to be dispensed, as determined by the control device.

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